Hazard areas are working

app.c

@@ -85,6 +85,10 @@ App *app_NewApp() {
 	misc_InstantiateHazardRespawn(app, respawn1, box2(300, 500, 400, 50), vec2(500, 550));
 	entity_Commit(app->entity, respawn1);
 
+	Entity *hazard1 = entity_Create(app->entity, "hazard1");
+	misc_InstantiateHazard(app, hazard1, box2(800, 545, 100, 5));
+	entity_Commit(app->entity, hazard1);
+
 	return app;
 }
 

app_render.cpp

@@ -70,8 +70,24 @@ void app_Render(App *app) {
 				line((int)round(pos.x + 12), (int)round(pos.y), (int)round(pos.x - 12), (int)round(pos.y));
 				line((int)round(pos.x), (int)round(pos.y + 12), (int)round(pos.x), (int)round(pos.y - 12));
 			}
+			if (e->misc->hazard) {
+				setlinecolor(RGB(255, 0, 0));
+				Box2 box;
+				if (e->position)
+					box = camera_TransformBox2(app->camera, box2_Offset(*e->misc->hazard, e->position->position));
+				else
+					box = camera_TransformBox2(app->camera, *e->misc->hazard);
+				rectangle(
+					(int)round(box.lefttop.x),
+					(int)round(box.lefttop.y),
+					(int)round(box.lefttop.x + box.size.x),
+					(int)round(box.lefttop.y + box.size.y));
+			}
 		}
 	}
+	setlinecolor(RGB(255, 0, 255));
+	Vec2 respawn = camera_TransformVec2(app->camera, app->player->player->hazardRespawn);
+	circle((int)round(respawn.x), (int)round(respawn.y), 6);
 
 
 	setfillcolor(RGB(255, 255, 255));

mapper_misc.c

@@ -3,6 +3,7 @@
 #include "app.h"
 #include "entity.h"
 #include "physics.h"
+#include "player.h"
 #include "types.h"
 #include "util/assert.h"
 #include <stdio.h>
@@ -48,6 +49,26 @@ void misc_thinker_HazardRespawn(App *app, Entity *e, Duration deltaTime) {
 		p->hazardRespawn = worldspawn;
 }
 
+void misc_thinker_Hazard(App *app, Entity *e, Duration deltaTime) {
+	if (!e->misc || !e->misc->hazard) {
+		WARN("called on an entity without misc or misc.textbox", 0);
+		return;
+	}
+	if (app->player->player == NULL) // No player
+		return;
+	Component_Player *p         = app->player->player;
+	Box2              playerbox = physics_HitboxAbsolute(p->super->hitbox);
+
+	Box2 worldbox; // Offset if position component exists
+	if (e->position)
+		worldbox = box2_Offset(*e->misc->hazard, e->position->position);
+	else
+		worldbox = *e->misc->hazard;
+
+	if (box2_Intersects(worldbox, playerbox, NULL))
+		player_HazardHarm(app->player);
+}
+
 void misc_thinker_Textbox(App *app, Entity *e, Duration deltaTime) {
 	if (!e->misc || !e->misc->textbox) {
 		WARN("called on an entity without misc or misc.textbox", 0);
@@ -102,3 +123,11 @@ void misc_InstantiateHazardRespawn(App *app, Entity *e, Box2 trigger_box, Vec2 r
 
 	e->thinker = &misc_thinker_HazardRespawn;
 }
+
+void misc_InstantiateHazard(App *app, Entity *e, Box2 trigger_box) {
+	ASSERT(e->misc == NULL && "Instantiate must be called with e.misc not set");
+	e->misc         = zero_malloc(sizeof(Component_Misc));
+	e->misc->hazard = copy_malloc_size(&trigger_box, sizeof(Box2));
+
+	e->thinker = &misc_thinker_Hazard;
+}

mapper_misc.h

@@ -39,6 +39,11 @@ typedef struct {
 void misc_thinker_HazardRespawn(App *app, Entity *e, Duration deltaTime);
 
 
+// Thinker for hazard areas
+// Tracks the player & harms on contact
+void misc_thinker_Hazard(App *app, Entity *e, Duration deltaTime);
+
+
 // Misc data an entity in the map might want.
 // Used as patches for quick logic like hazard respawn & textbox
 typedef struct {
@@ -59,6 +64,10 @@ void misc_InstantiateTextbox(App *app, Entity *e, const char *text, Box2 trigger
 // Creates misc & sets the thinker.
 void misc_InstantiateHazardRespawn(App *app, Entity *e, Box2 trigger_box, Vec2 respawn_pos);
 
+// Inserts the components for a hazard harming area.
+// Creates misc & sets the thinker.
+void misc_InstantiateHazard(App *app, Entity *e, Box2 trigger_box);
+
 
 static inline Box2 misc_TextboxUpright(double width, double height) {
 	Box2 b = {

types.h

@@ -30,6 +30,12 @@ static inline char *copy_malloc(const char *src) {
 	return p;
 }
 
+static inline void *copy_malloc_size(void *src, size_t size) {
+	void *p = malloc(size);
+	memcpy(p, src, size);
+	return p;
+}
+
 
 // A 2d vector of double.
 typedef struct {